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In a room filled with 7 people, 4 people have exactly 1

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SVP
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Joined: 21 Jul 2006
Posts: 1550
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Kudos [?]: 211 [0], given: 1

In a room filled with 7 people, 4 people have exactly 1 [#permalink] New post 24 Nov 2007, 08:49
In a room filled with 7 people, 4 people have exactly 1 friend in the room and 3 people have exactly 2 friends in the room (Assuming that friendship is a mutual relationaship, i.e. if John is Peter's friend, Peter is John'd friend). If two individuals are selected from the room at random, what is the probability that those two individuals are NOT friend?

a) 5/21
b) 3/7
c) 4/7
d) 5/7
e) 16/21
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CEO
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Joined: 17 Nov 2007
Posts: 3571
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
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Kudos [?]: 1808 [0], given: 358

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 [#permalink] New post 24 Nov 2007, 08:55
Expert's post
SVP
SVP
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Joined: 21 Jul 2006
Posts: 1550
Followers: 8

Kudos [?]: 211 [0], given: 1

 [#permalink] New post 24 Nov 2007, 09:41
that was great....thanks
  [#permalink] 24 Nov 2007, 09:41
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In a room filled with 7 people, 4 people have exactly 1

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